JP3340366B2 - Ground vibration isolation wall structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a ground vibration isolating wall structure,
In particular, the present invention relates to a ground vibration isolating wall structure for preventing vibrations generated by road traffic or rail traffic, vibrations generated from factories, and the like from being transmitted to the adjacent roadside or railroad ground via the ground.

[0002]

2. Description of the Related Art Vibration generated when a vehicle travels on a road or an elevated track, or vibration generated by a large machine tool or the like in a factory is transmitted to an adjacent ground through the ground, thereby causing vibration pollution. May cause. As a countermeasure against this, providing a vibration isolating wall in the ground in the vibration propagation path is performed.

[0003] It is known that a synthetic resin foam such as a polystyrene foam is advantageous as an anti-vibration wall in terms of an anti-vibration effect. A vibration-proof wall structure is made by combining a synthetic resin foam with concrete or a metal plate having excellent strength. FIG. 3 is an example of this, in which a block-shaped vibration-proof material 1 mainly made of a hard synthetic resin foam is used between a road or a railway and a nearby house, that is, a polystyrene foam having an expansion ratio of about 50 times. Concrete 2 having reinforcing bars 3 on both sides of the vibration damping material 1 arranged side by side in the ground along the vibration propagation path is cast as a strength retaining material. In this example, irregularities 4 are formed on the surface of the vibration-proof material 1 to increase the contact area with the concrete 2,
The floating of the vibration isolating material 1 is also prevented by the buoyancy of the groundwater and the vibration isolating material 1. The top end side of the anti-vibration wall thus formed in the ground is usually 30 to 60 cm from the ground surface.
It is normal to be in a position where it has penetrated to a certain extent, and after forming the vibration isolating wall, it is buried and buried with a backfill material such as soil excavated at the time of construction, and backfilling is performed. In some cases, it is backfilled by casting concrete. The backfill portion 5 is provided to prevent the vibration-proof material, which is a synthetic resin foam, from being broken by a load when a vehicle, a pedestrian, or the like passes over the ground surface. It is absolutely necessary to prevent the top end face of the vibration material from directly appearing on the ground surface.

FIG. 4 shows another example, in which metal plates (iron sheet piles) 2 a and 2 a are continuously driven in parallel in the depth direction of the ground 13 along the bridge 12 of the elevated railway 10. Thereafter, a gap between the metal plates 2a, 2a is excavated to a predetermined depth, and a closed-cell hard polyurethane resin 1a is injected into the excavation to foam urethane, thereby constructing a vibration-proof wall.
The top end side of the foamed polyurethane 1a is cut flat, a top plate 6 is laid thereon, and an embankment 5 of about 30 cm is laid from above to form a vibration-proof wall structure. The provision of the top plate 6 prevents the anti-vibration material 1a from breaking, and also prevents the oil component and the like from penetrating into the anti-vibration material 1a.

[0005]

The ground vibration isolating wall constructed as described above is effective as a vibration isolating wall for reflecting and blocking vibrations from roads, railway tracks, viaducts and the like, and is widely used. Have been. However, when the anti-vibration performance of the actually installed anti-vibration wall of the ground is observed, it may not always be sufficient. The present inventors have perceived that the deterioration of the vibration isolation performance is attributable to the backfill portion 5 formed on the top end side of the vibration isolation wall by performing many experiments to know the cause. In other words, it has been found that most of the vibration is reflected and cut off by the vibration isolating wall itself, but a part of the vibration propagates through the backfill portion 5, so that the overall vibration isolating performance is reduced.

The present invention is based on the above findings. Basically, a vibration damping material made of a synthetic resin foam is arranged in the ground in a vibration propagation path, and a concrete plate or a metal plate is provided on both sides thereof. A ground vibration isolating wall structure having an underground vibration isolating wall provided with such a strength retaining material, and a backfilling portion covering a top end side of the underground vibration isolating wall, wherein the backfilling portion Is characterized by being separated by a vibration isolator in order to prevent propagation of vibrations through the backfilled portion.

According to this structure, the vibration which propagates to the adjacent ground through the ground is not only blocked by the underground vibration-proof wall, but also in the back-filled portion at the top end. Since the vibration is blocked or reflected by the vibration isolator disposed thereon, the propagation of the vibration over the vibration isolating wall structure can be almost completely prevented, and a high vibration isolating effect is achieved.

In the present invention, the structure of the underground vibration isolating wall itself is optional, and not only the vibration isolating wall having the structure shown in FIGS. 3 and 4 but also any conventionally known vibration isolating wall. Can be used. A synthetic resin foam as an anti-vibration material for constructing an underground anti-vibration wall is also optional. As the resin, polystyrene, polypropylene, phenol resin, polyurethane, or the like is used. Further, the vibration damping material may be a block-shaped synthetic resin foam as shown in FIG. 3 or a foamed and molded material at a construction site as shown in FIG.

Conventionally, the vibration isolating material for dividing the backfill portion has been
Materials used for vibration isolation can be used as appropriate, but from the viewpoint of strength and flame retardancy, vibration-proof rubber molded into a sheet or various shapes, or synthetic resin foam with elasticity to prevent transmission of vibration It may be a body-like material. The cross-sectional shape of the anti-vibration material may be a simple plate, but if a trapezoidal cross-section is used, the load from the ground surface must be distributed to the top end surface of the anti-vibration material of the underground anti-vibration wall And a long-term stable ground vibration isolating wall structure can be constructed.
When using a vibration-isolating material having a bent portion in part, the bent portion effectively prevents oily components from the ground surface from penetrating into the vibration-proof material of the underground vibration-proof wall. Can be.

[0010] In the ground vibration isolating wall structure of the present invention, it is a preferable embodiment to dispose the top plate on the synthetic resin foams arranged side by side. It is possible to prevent the material from being carelessly deformed or deteriorated due to the intrusion of the oil component. The material of the backfill portion may be not only soil excavated, but also concrete casting depending on the environment in which the vibration isolating wall structure is provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments. FIG. 1 shows a case where the present invention is applied to the conventional ground vibration isolating wall structure described with reference to FIG. The same members as those in FIG. 3 are denoted by the same reference numerals, and detailed description will be omitted.

As shown in the figure, in this embodiment, the underground vibration isolating wall is provided on the top end face 1t of the vibration isolating material 1 which is, for example, a polystyrene foam, in the longitudinal direction (the longitudinal direction of the vibration isolating material 1). (In the direction perpendicular to the plane of the paper in the drawing), a long anti-vibration rubber A having a rectangular cross section is disposed, and backfilled portions 5a and 5b are formed on both sides thereof, and the anti-vibration of the ground according to the present invention is achieved. We are building a wall structure. The construction procedure of this vibration isolating wall structure may be the same as the ordinary construction procedure. For example, a steel sheet pile (not shown) is driven at a predetermined interval, and the gap between the sheet piles is excavated to a predetermined depth (for example, about 300 cm). After fixing 3 in a predetermined position, the size is, for example, 2000 mm × 1000.
An anti-vibration material 1 such as a block-like polystyrene foam of about mm × 500 mm is set at a predetermined position. In this example, the polystyrene foam is piled up and down in two stages, but this is appropriately selected based on the size of the polystyrene foam and the depth required for the underground vibration isolating wall, and However, it may be stacked. In addition, anti-vibration material 1
The position of the top end surface 1t is set to be a position lower by about 30 to 60 cm from the ground surface.

After setting, concrete 2 as a strength retaining material is poured between the steel sheet piles to the vicinity of the top end 1a of the vibration-proof material 1, and after the concrete is fixed, the steel sheet pile is pulled out, whereby the underground vibration-proof wall is constructed. You. Next, while placing a long anti-vibration rubber A having a height substantially equal to the height from the top end surface 1t of the vibration isolating material 1 to the ground surface on the top end surface 1t of the vibration isolating material 1, The soil excavated on both sides is backfilled and leveled. As a result, the backfill portions 5a and 5b are arranged separately on both sides of the vibration-proof rubber A, and the transmission of vibrations through the backfill portions is largely prevented.

FIG. 2A shows another embodiment of the ground vibration isolating wall structure according to the present invention. In this example, the cross-sectional shape of the anti-vibration rubber A as the anti-vibration material is not a simple rectangular shape but a trapezoidal shape. In this case, the load from the ground surface can be dispersed to the top end surface 1t of the vibration isolating material 1 of the underground vibration isolating wall, and deformation and the like of the vibration isolating material 1 can be prevented. Further, in this example, concrete 2 as a strength retaining material of the underground vibration isolating wall is used.
Is not reinforced by a reinforcing bar, but whether or not to insert a reinforcing bar may be appropriately selected according to the installation environment of the ground vibration-proof wall structure.

FIG. 2 (b) shows still another embodiment of the ground vibration isolating wall structure according to the present invention. In this example, the cross-sectional shape of the vibration-proof rubber A, which is a vibration-proof material, is bent, and includes a first vertical part A1, a horizontal part A2, and a second vertical part A3. The use of the anti-vibration rubber A having such a shape has an advantage that an oil component or the like that seeps from the ground surface can be effectively prevented from entering the top end face portion of the anti-vibration material 1. Further, in this example, the polystyrene foam as the vibration damping material 1 has a trapezoidal shape, but this shape can more reliably prevent the vibration damping material 1 from rising due to groundwater or buoyancy.

The above is a description of the preferred embodiment of the ground vibration isolating wall structure according to the present invention, and the present invention is not limited to this, and there are many variations. For example, although not shown, the top plate 6 may be arranged on a side-by-side synthetic resin foam which is a vibration-proof material as in the case of the vibration-proof wall structure shown in FIG. In this case, a more complete separation of the backfilled portion can be obtained by dividing the top plate to be arranged into two and separately arranging them on the left and right sides of the vibration isolation rubber A,
Although a high anti-vibration effect can be obtained, a top plate may be arranged on the entire top surface 1t of the anti-vibration material in consideration of workability, and the anti-vibration rubber A as an elastic material may be placed thereon. Considerable anti-vibration effects are achievable. Further, as described above, the configuration of the underground vibration isolating wall itself is arbitrary, and the present invention is applied to a backfill portion of the underground vibration isolating wall employing the urethane foaming technology as shown in FIG. Of course, it is also possible.

[0017]

According to the present invention, it is possible to reliably prevent the propagation of vibrations through the backfilling portion above the underground vibration isolating wall in the vibration isolating wall structure of the ground, and the ground having a high vibration isolating effect. The anti-vibration wall structure is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a ground vibration isolating wall structure according to the present invention.

FIG. 2 is a view for explaining another embodiment of the ground vibration isolating wall structure according to the present invention.

FIG. 3 is a diagram for explaining a ground vibration isolating wall structure having a conventional structure.

FIG. 4 is a view for explaining another ground vibration isolating wall structure having a conventional structure.

[Explanation of symbols]

A: anti-vibration material, 5a, 5b: backfilled portion, 1: anti-vibration material for underground vibration-proof wall, 2: concrete as strength support material support, 3: rebar, 4: unevenness

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 31/08 E01C 11/24 F16F 15/02

Claims (3)

(57) [Claims] 1. An underground structure in which a vibration damping material made of a synthetic resin foam is arranged in the ground in a vibration propagation path, and a strength retaining material such as a concrete plate or a metal plate is disposed on both sides thereof. A ground vibration isolating wall structure having a vibration isolating wall and a backfilling portion covering a top end side of the underground vibration isolating wall, wherein the backfilling portion is configured such that vibration propagates through the backfilling portion. A vibration isolating wall structure for a ground, which is separated by a vibration isolating material in order to prevent the vibration. 2. The ground vibration isolating wall structure according to claim 1, wherein the vibration isolating material is a rubber rubber. 3. The ground vibration isolating wall structure according to claim 1, wherein a top plate is disposed on the synthetic resin foams arranged side by side, and a backfill portion is formed thereon. .